Req #67346 [NEW]: array_rand() performance issue

From: Date: Tue, 27 May 2014 11:40:19 +0000
Subject: Req #67346 [NEW]: array_rand() performance issue
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-185934@lists.php.net to get a copy of this message 
From:             v dot martyanov at drweb dot com
Operating system: Any
PHP version:      5.5.12
Package:          Arrays related
Bug Type:         Feature/Change Request
Bug description:array_rand() performance issue

Description:
------------
There is a performance issue in array_rand(). The problem is in using
doubles instead of long integers in the source.

In the case when num_req == 1 and num_avail < 256 it's not so hard to
use tables with precomputed values and avoid the usage of divisions and
doubles.


-- 
Edit bug report at https://bugs.php.net/bug.php?id=67346&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=67346&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=67346&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=67346&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=67346&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=67346&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=67346&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=67346&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=67346&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=67346&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=67346&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=67346&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=67346&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=67346&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=67346&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=67346&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=67346&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=67346&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=67346&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=67346&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=67346&r=mysqlcfg

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